Stock-Based Compensation - Stock Options (Details) - Stock Options - USD ($)	3 Months Ended			6 Months Ended
	Jan. 31, 2017	Oct. 31, 2016	Jan. 31, 2016	Jan. 31, 2017	Jan. 31, 2016
Awards (in Shares)
Outstanding, Beginning Balance (in shares)	2,138,174	2,256,679		2,256,679
Expired/canceled (in shares)	(227,598)	(118,505)
Exercised (in shares)			0	0
Outstanding, Ending Balance (in shares)	1,910,576	2,138,174		1,910,576
Exercisable, Ending Balance (in shares)	1,168,372			1,168,372
Vested and Expected to Vest, Ending Balance (in shares)	1,850,536			1,850,536
Weighted Average Exercise Price
Outstanding, Beginning Balance (in dollars per share)	$ 28.96	$ 28.87		$ 28.87
Expired/canceled (in dollars per share)	32.06	27.34
Outstanding, Ending Balance (in dollars per share)	28.59	$ 28.96		28.59
Exercisable, Ending Balance (in dollars per share)	28.57			28.57
Vested and Expected to Vest, Ending Balance (in dollars per share)	$ 28.58			$ 28.58
Weighted Average Remaining Contractual Term (Years)
Outstanding, Ending Balance				6 years 4 days
Exercisable, Ending Balance				5 years 2 months 4 days
Vested And Expected To Vest, Ending Balance				5 years 11 months 18 days
Aggregate Intrinsic Value
Outstanding, Ending Balance	$ 0			$ 0
Exercisable, Ending Balance	0			0
Vested and Expected to Vest, Ending Balance	$ 0			$ 0
Additional Disclosures
Exercise price, lower range limit (in dollars per share)				$ 12.43
Exercise price, upper range limit (in dollars per share)				$ 33.94
Granted (in shares)				0
Total intrinsic value of stock-based awards settled					$ 32,000
Vested stock based awards net settled upon exercise (in shares)				0	19,200
Common stock issued for net settlement of stock-based awards (in shares)					706
Per share weighted average grant date fair value of stock based awards granted (in dollars per share)			$ 3.69		$ 5.69
Fair Value Assumptions
Expected dividend yield			5.74%		4.32%
Expected volatility			34.76%		34.27%
Risk-free interest rate			1.64%		1.54%
Expected life (years)			5 years 15 days		5 years 1 month 29 days
Minimum
Additional Disclosures
Contractual term (in years)					5 years
Vesting period (in years)					3 years
Maximum
Additional Disclosures
Contractual term (in years)					10 years
Vesting period (in years)					5 years